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"There ain't no such thing as a free lunch" expresses the idea that even if something seems like it is free, there is always a cost, no matter how indirect or hidden.
After ten centuries of wars, defeats, and victories, the Byzantine Empire came to an end when Constantinople fell to the Ottoman Turks in May 1453. The city's fall sent shock waves throughout Christendom. It is widely quoted as the event that marked the end of the European Middle Ages.
The U.S government set out to dispossess the Native Americans of their remaining rich lands and drive them westward.